12016549999 has 4 divisors (see below), whose sum is σ = 12082939960. Its totient is φ = 11950160040.

The previous prime is 12016549991. The next prime is 12016550017. The reversal of 12016549999 is 99994561021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12016549999 - 2³ = 12016549991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12016549991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33194709 + ... + 33195070.

It is an arithmetic number, because the mean of its divisors is an integer number (3020734990).

Almost surely, 2^12016549999 is an apocalyptic number.

12016549999 is a deficient number, since it is larger than the sum of its proper divisors (66389961).

12016549999 is an equidigital number, since it uses as much as digits as its factorization.

12016549999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66389960.

The product of its (nonzero) digits is 1574640, while the sum is 55.

The spelling of 12016549999 in words is "twelve billion, sixteen million, five hundred forty-nine thousand, nine hundred ninety-nine".